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Digital AGC (automatic gain control) rapid adjustment method applied to OFDM (orthogonal frequency division multiplexing)

A technology of automatic gain control and rapid adjustment, applied in electrical components, power management, multi-frequency code systems, etc., can solve problems such as poor stability, fluctuation, and misadjustment, to meet performance requirements, adapt to a large dynamic range, and adjust quickly. Effect

Active Publication Date: 2014-07-02
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The adjustment speed and stability of the AGC method are double-edged swords. The adjustment speed is fast, and the received signal amplitude can be stabilized in a short period of time, which can reduce the AGC adjustment overhead and improve data utilization. However, the fast adjustment speed will cause large Fluctuations and small noises may cause misadjustment and poor stability

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  • Digital AGC (automatic gain control) rapid adjustment method applied to OFDM (orthogonal frequency division multiplexing)
  • Digital AGC (automatic gain control) rapid adjustment method applied to OFDM (orthogonal frequency division multiplexing)
  • Digital AGC (automatic gain control) rapid adjustment method applied to OFDM (orthogonal frequency division multiplexing)

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Embodiment Construction

[0021] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0022] The present invention relates to a digital automatic gain control fast adjustment method applied in OFDM, and a specific embodiment of the present invention in wireless sensor network application will be described in detail below.

[0023] figure 1 It is a structural diagram of digital automatic gain control, which uses OFDM for communication, and the digital automatic gain control method is negative feedback. figure ...

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Abstract

The invention relates to a digital AGC (automatic gain control) rapid adjustment method applied to OFDM (orthogonal frequency division multiplexing), which comprises the following steps of: (1) calculating the power of a received signal by way of combining FIR (finite impulse response) and IIR (infinite-duration impulse response); (2) converting the power of the received signal into a corresponding logarithmic form p_dB (n); and (3) comparing the power of the current signal with an ideal power of the signal so as to obtain a difference value, then calculating a corresponding adjusted gain value according to the difference value, and carrying out feedback adjustment. In the invention, the power of the received signal is calculated by way of combining FIR and IIR, so that a good compromise between an adjusted speed and adjusted stability can be found.

Description

technical field [0001] The invention relates to the field of wireless sensor network communication, in particular to a digital automatic gain control fast adjustment method applied in OFDM. Background technique [0002] Wireless Sensor Network (WSN) is an "intelligent" network composed of miniature sensor nodes with wireless communication, perception and computing capabilities. It has been widely used in various fields such as military, agriculture, environmental testing, medical and health care, industry, and intelligent transportation. With the application and promotion of wireless sensor networks, the communication distance increases and the communication rate increases. At present, Orthogonal Frequency Division Multiplexing (OFDM) communication system is generally used for medium and high-speed wireless sensors. Internet application. [0003] OFDM technology was proposed in the 1950s and 1960s. It divides the entire transmission bandwidth into a series of mutually ort...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04W52/52
Inventor 罗炬锋张诚占云龙高丹
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI